why-study-viscous-flow - they become less interesting....

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S.P. Schneider, Purdue AAE Why Study Viscous Flow? 1. Skin Friction can be significant to Drag. For slender high L/D vehicles at all speed ranges. Global Hawk to NASP. 2. Boundary-layer Separation is one example of critical viscous/inviscid interactions. Can be a major factor in drag, heating, pressure distribution, max L/D, aerodynamic stability, etc. From a golf ball to a reentry capsule. Also shock/boundary-layer interactions, etc. 3. Aeroheating is fundamentally a viscous effect. Can dominate the design of hypersonic vehicles. Most inviscid effects can now be computed fairly readily, so
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Unformatted text preview: they become less interesting. Viscous effects and viscous interaction effects are now often the critical issues in design. S.P. Schneider, Purdue AAE Transition Delays Separation Laminar separated Turbulent attached Mercury capsule at Mach 3.28 AIAA 2005-4763 tripped with rough face smooth face Classic example is the golf ball, which has lower drag due to reduced afterbody separation with a tripped turbulent b.l. Here, on a capsule, transition on the face also delays separation...
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This note was uploaded on 01/15/2012 for the course AAE 490 taught by Professor Andrisani during the Fall '09 term at Purdue University-West Lafayette.

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why-study-viscous-flow - they become less interesting....

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